Still, it should work. One thing I don't like is that you have /usr/lib64/openmpi/bin at the end of your PATH - that's a bad idea. Most OS's come with a preinstalled version, usually something really old, so you want the desired version of OMPI to be at the front of your path.

Do you have LD_LIBRARY_PATH set as well? Again, you need /usr/lib64/openmpi/lib set at the very front of that envar.